Long-Term Performance of Geogrid-Reinforced Mechanically Stabilized Earth (MSE) Berms

In the Fall of 2000, the first of two mechanically stabilized earth (MSE) berms was completed at the G.R.O.W.S. Landfill located in Morrisville, Pennsylvania as part of the Southwest Expansion construction. A second MSE berm was subsequently constructed as part of the Northeast Expansion and was completed during the Winter of 2001. Both of these berms have been monitored for wall movement and deflection prior to waste placement and while the adjacent landfill cells were being filled. Slope inclinometer casings were installed in the berms and monitored periodically over the past four years during the course of landfill operations. This paper will discuss the performance of the MSE berms in terms of movement monitored by the slope inclinometers.